Save tableView content to NSUserDefaults Swift - arrays

Question

I have table view which displays a list of items. Every time a row is selected, a checkmark is added, a corresponding amount is added to var total.
If another row is selected the checkmark of the previous row is removed,the amount for the previous row is subtracted.
I am trying to save and retrieve to/from NSUserdefaults the following info:
checkmark of the row selected (if any was selected),
value for var total,
indexPathForCellSelected,
,amount for the specific row that was selected.
import UIKit
class EighthViewController: UIViewController, UITableViewDelegate,UITableViewDataSource {
struct Item {
var name:String // name of the row
var selected:Bool // whether is selected or not
var amount: Int // value of the item
}
var frequency = [
Item(name:"Every week",selected: false, amount: 30),
Item(name:"Every 2 weeks",selected: false, amount: 30),
Item(name:"Every 4 weeks",selected: false, amount: 30),
Item(name:"Once",selected: false, amount: 40),
Item(name:"End of tenancy cleaning", selected: false, amount: 44)
]
var total = 0
var indexPathForCellSelected: NSIndexPath?
#IBOutlet weak var tableView: UITableView!
let indexKey = "indexPathForCellSelected"
let totalKey = "total"
let amountKey = "amount"
override func viewDidLoad() {
}
override func viewDidAppear(animated: Bool) {
super.viewDidAppear(animated)
// retrieve indexPathForCellSelected from NSUserDefaults
if let retrievedIndexPath = NSUserDefaults.standardUserDefaults().objectForKey(indexKey) {
let data1 = NSUserDefaults.standardUserDefaults().objectForKey(indexKey) as? NSData
indexPathForCellSelected = NSKeyedUnarchiver.unarchiveObjectWithData(data1!) as? NSIndexPath
// retrieve total from NSUserDefaults
if let totalRetrieved = NSUserDefaults.standardUserDefaults().objectForKey(totalKey) as? Int {
total = totalRetrieved
print(total)
}
//
if let itemAmount = NSUserDefaults.standardUserDefaults().objectForKey(amountKey) as? Int {
let myIndexpath = indexPathForCellSelected?.row
frequency[myIndexpath!].amount = itemAmount
**UPDATED:** tableView.cellForRowAtIndexPath(indexPathForCellSelected!)?.accessoryType = .Checkmark
}
}
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return frequency.count
}
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
// configure the cell
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath)
-> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("Cell")
cell?.textLabel?.text = frequency[indexPath.row].name
return cell!
}
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
if !frequency[indexPath.row].selected {
// this avoid set initial value for the first time
if let index = indexPathForCellSelected {
// clear the previous cell
frequency[index.row].selected = false
tableView.cellForRowAtIndexPath(index)?.accessoryType = .None
self.total -= frequency[index.row].amount
print(total)
}
// mark the new one
frequency[indexPath.row].selected = true
tableView.cellForRowAtIndexPath(indexPath)?.accessoryType = .Checkmark
indexPathForCellSelected = indexPath
self.total += frequency[indexPath.row].amount
print(total)
if indexPathForCellSelected != nil { // check if there is a selected row in the table
//save indexPathForCellSelected in NSUserDefaults
let data = NSKeyedArchiver.archivedDataWithRootObject(indexPathForCellSelected!)
NSUserDefaults.standardUserDefaults().setObject(data, forKey: indexKey)
//save total in NSUserDefaults
NSUserDefaults.standardUserDefaults().setObject(total, forKey: totalKey)
// save amount in NSUserDefaults
NSUserDefaults.standardUserDefaults().setObject(frequency[indexPath.row].amount, forKey: amountKey)
} // end of if indexPathForCellSelected
}
}
}
here is screenshot from the app : link

Answer 1

This code works. If anyone has a better implementation, please post it in the answer section.
class EighthViewController: UIViewController, UITableViewDelegate,UITableViewDataSource {
struct Item {
var name:String // name of the row
var selected:Bool // whether is selected or not
var amount: Int // value of the item
}
var frequency = [
Item(name:"Every week",selected: false, amount: 30),
Item(name:"Every 2 weeks",selected: false, amount: 30),
Item(name:"Every 4 weeks",selected: false, amount: 30),
Item(name:"Once",selected: false, amount: 40),
Item(name:"End of tenancy cleaning", selected: false, amount: 44)
]
var total = 0
var indexPathForCellSelected: NSIndexPath?
#IBOutlet weak var tableView: UITableView!
let indexKey = "indexPathForCellSelected"
let totalKey = "total"
let amountKey = "amount"
override func viewDidLoad() {
}
override func viewDidAppear(animated: Bool) {
super.viewDidAppear(animated)
// retrieve indexPathForCellSelected from NSUserDefaults
if let retrievedIndexPath = NSUserDefaults.standardUserDefaults().dataForKey(indexKey) {
if let data1 = NSKeyedUnarchiver.unarchiveObjectWithData(retrievedIndexPath) as? NSIndexPath{
indexPathForCellSelected = data1
}
// retrieve total from NSUserDefaults
if let totalRetrieved = NSUserDefaults.standardUserDefaults().objectForKey(totalKey) as? Int {
total = totalRetrieved
print(total)
}
//
if let itemAmount = NSUserDefaults.standardUserDefaults().objectForKey(amountKey) as? Int {
let myIndexpath = indexPathForCellSelected?.row
frequency[myIndexpath!].amount = itemAmount
tableView.cellForRowAtIndexPath(indexPathForCellSelected!)?.accessoryType = .Checkmark
}
}
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return frequency.count
}
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
// configure the cell
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath)
-> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("Cell")
cell?.textLabel?.text = frequency[indexPath.row].name
return cell!
}
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
if !frequency[indexPath.row].selected {
// this avoid set initial value for the first time
if let index = indexPathForCellSelected {
// clear the previous cell
frequency[index.row].selected = false
tableView.cellForRowAtIndexPath(index)?.accessoryType = .None
self.total -= frequency[index.row].amount
print(total)
}
// mark the new one
frequency[indexPath.row].selected = true
tableView.cellForRowAtIndexPath(indexPath)?.accessoryType = .Checkmark
self.total += frequency[indexPath.row].amount
indexPathForCellSelected = indexPath
print(total)
if indexPathForCellSelected != nil { // check if there is a selected row in the table
//save indexPathForCellSelected in NSUserDefaults
let data = NSKeyedArchiver.archivedDataWithRootObject(indexPathForCellSelected!)
NSUserDefaults.standardUserDefaults().setObject(data, forKey: indexKey)
//save total in NSUserDefaults
NSUserDefaults.standardUserDefaults().setObject(total, forKey: totalKey)
// save amount in NSUserDefaults
NSUserDefaults.standardUserDefaults().setObject(frequency[indexPath.row].amount, forKey: amountKey)
} // end of if indexPathForCellSelected
}
}
}